/* ============================================================
   style.css — SEP Interactive component styles
   ============================================================ */

.font-mono {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 200;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
}
.skip-link:focus {
  top: var(--space-4);
}

/* ---------- Layout helpers ---------- */
.section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
}
.section > * {
  width: min(100% - 2.5rem, var(--content-wide));
  margin-inline: auto;
}
.section--surface {
  background: var(--color-surface-offset);
  border-block: 1px solid var(--hairline);
}

.section-head {
  max-width: var(--content-default);
  margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
}
.kicker {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.section-head h2 {
  font-size: var(--text-2xl);
  font-weight: 800;
}
.lead {
  margin-top: var(--space-5);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 60ch;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 500;
  font-size: var(--text-sm);
  padding: 0.75rem 1.35rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  white-space: nowrap;
  min-height: 44px;
}
.btn-sm {
  padding: 0.55rem 1rem;
  min-height: 40px;
}
.btn-lg {
  padding: 0.95rem 1.75rem;
  font-size: var(--text-base);
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-ghost {
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  color: var(--color-primary);
  font-weight: 500;
  font-size: var(--text-sm);
  margin-top: var(--space-2);
}
.text-link:hover {
  gap: 0.6em;
}
/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
.site-header.is-scrolled {
  border-bottom-color: var(--hairline);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  width: min(100% - 2.5rem, var(--content-wide));
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: 4.5rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 30px;
  height: auto;
}
.brand-name-accent {
  color: var(--color-text-muted);
  font-weight: 500;
  margin-left: 0.18em;
}
.nav {
  display: flex;
  gap: var(--space-6);
  margin-left: auto;
}
.nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  position: relative;
  padding-block: 0.25rem;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-interactive);
}
.nav a:hover,
.nav a.is-active {
  color: var(--color-text);
}
.nav a:hover::after,
.nav a.is-active::after {
  width: 100%;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: var(--space-2);
}
.theme-toggle {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.theme-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.menu-btn span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.25s, opacity 0.2s;
}
.menu-btn[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-btn[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.menu-btn[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}
.mobile-nav[hidden] {
  display: none;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4) clamp(1.25rem, 5vw, 2rem) var(--space-6);
  border-top: 1px solid var(--hairline);
}
.mobile-nav a {
  font-size: var(--text-base);
  font-weight: 500;
  padding: var(--space-2) 0;
  color: var(--color-text);
}
.mobile-nav .btn {
  margin-top: var(--space-2);
  justify-content: center;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
  overflow: hidden;
}
.hero::before {
  /* subtle radial glow anchored top-left, brand cyan */
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 15% 0%, var(--color-primary-soft), transparent 70%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  width: min(100% - 2.5rem, var(--content-wide));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(var(--space-8), 5vw, var(--space-20));
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  margin-bottom: var(--space-6);
}
.eyebrow .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-soft);
}
.hero h1 {
  font-size: var(--text-hero);
  font-weight: 800;
  line-height: 0.98;
}
.accent-text {
  background: linear-gradient(100deg, var(--grad-a), var(--grad-b));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  margin-top: var(--space-6);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 52ch;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--hairline);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.hero-meta strong {
  color: var(--color-text);
  font-weight: 700;
}

.hero-visual {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  background: var(--color-surface);
}
.hero-visual img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}
.hero-visual-tag {
  position: absolute;
  left: var(--space-4);
  bottom: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text);
  background: color-mix(in srgb, var(--color-bg) 80%, transparent);
  backdrop-filter: blur(6px);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--hairline);
}

/* ============================================================
   WORK — duo cards
   ============================================================ */
.duo {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}
.duo-card {
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  position: relative;
  overflow: hidden;
}
.duo-card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--grad-a), var(--grad-b));
  opacity: 0.8;
}
.duo-mark {
  display: inline-grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  color: var(--color-primary);
  background: var(--color-primary-soft);
  margin-bottom: var(--space-5);
}
.duo-card h3 {
  font-size: var(--text-xl);
}
.duo-role {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-faint);
  margin: var(--space-2) 0 var(--space-4);
}
.duo-card p {
  color: var(--color-text-muted);
}

/* ============================================================
   SERVICES — tabs + panels
   ============================================================ */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-10);
  border-bottom: 1px solid var(--hairline);
  padding-bottom: var(--space-2);
}
.tab {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
}
.tab:hover {
  color: var(--color-text);
  background: var(--color-surface);
}
.tab.is-active {
  color: var(--color-text-inverse);
  background: var(--color-primary);
}

.panel[hidden] {
  display: none;
}
.panel {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: clamp(var(--space-6), 4vw, var(--space-12));
  align-items: start;
  animation: fade-up 0.4s ease both;
}
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
.panel-grid {
  display: grid;
  gap: var(--space-8);
}
.panel-intro h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}
.panel-intro p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}
.svc-list {
  display: grid;
  gap: 0;
}
.svc-list li {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--hairline);
  max-width: none;
}
.svc-list li:last-child {
  border-bottom: 1px solid var(--hairline);
}
.svc-no {
  flex-shrink: 0;
  font-size: var(--text-xs);
  color: var(--color-primary);
  padding-top: 0.2rem;
  width: 2.2em;
}
.svc-list strong {
  display: block;
  font-size: var(--text-base);
  margin-bottom: 0.15rem;
}
.svc-list p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
}
.panel-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 6rem;
}
.panel-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ============================================================
   PROCESS — steps
   ============================================================ */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}
.step {
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  max-width: none;
}
.step-no {
  display: block;
  font-size: var(--text-lg);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.step h3 {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.step p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact-inner {
  max-width: var(--content-default);
  text-align: center;
  margin-inline: auto;
}
.contact .kicker {
  text-align: center;
}
.contact h2 {
  font-size: var(--text-2xl);
  font-weight: 800;
}
.contact .lead {
  margin-inline: auto;
  text-align: center;
}
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-8);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--hairline);
  background: var(--color-surface-offset);
}
.footer-inner {
  width: min(100% - 2.5rem, var(--content-wide));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: var(--space-8);
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}
.footer-wordmark {
  width: 180px;
  height: auto;
  margin-bottom: var(--space-4);
}
[data-theme="light"] .footer-wordmark {
  filter: invert(1) brightness(0.4) saturate(1.4);
}
.footer-tag {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 38ch;
}
.footer-h {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
  font-weight: 600;
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer-col a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.footer-col a:hover {
  color: var(--color-primary);
}
.footer-bottom {
  width: min(100% - 2.5rem, var(--content-wide));
  margin-inline: auto;
  border-top: 1px solid var(--hairline);
  padding-block: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer-privacy a {
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.footer-privacy a:hover {
  color: var(--color-primary);
}

/* ============================================================
   REVEAL animation
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .nav {
    display: none;
  }
  .menu-btn {
    display: flex;
  }
  .header-actions .btn-sm {
    display: none;
  }
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-visual {
    max-width: 460px;
  }
  .duo,
  .panel {
    grid-template-columns: 1fr;
  }
  .panel-figure {
    position: static;
  }
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 540px) {
  .steps {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    grid-template-columns: 1fr;
  }
  .hero-meta {
    gap: var(--space-4);
  }
}